WHS Outlook allows you to use Microsoft Outlook via the Windows Home Server Console. It does require you to install Outlook on your server, and he has stated that it requries Office 2002 or newer. You can store the “PST” files (which contains all of your mail and a number of settings) on either the system partion or on the network shares. He recommends using Power Pack 1, and if you are going to store the PST Files on network shares, you will need to have Power Pack 1 installed or they will likely become corrupt.
Mark Craven stated WHS Outlook will work with a trial verion of Outlook so if you don’t have a spare copy, you can always use a trial. Although, it will prompt you to upgrade to the full version, so if you don’t mind annoying pop ups, this is a great way to test it.